To find the number of three-digit combinations, we consider the digits from 000 to 999. Each digit can range from 0 to 9, giving us 10 options for each of the three digits. Therefore, the total number of three-digit combinations is (10 \times 10 \times 10 = 1,000).
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5
6 of them.
There are 15180 combinations.
there are 10 possibilities for the first spot, 9 for the second, 8 for the third 10x9x8=720 combinations
There are 5,461,512 such combinations.